What is Walther Bothe known for?
I am best known for developing the coincidence method, a technique that detects two or more particles arriving at separate detectors within a minuscule time window, typically a few nanoseconds. This allowed us to confirm that energy and momentum are conserved in individual quantum events, such as Compton scattering, by recording the scattered photon and recoil electron simultaneously. My work with Hans Geiger on this method provided direct experimental evidence for the particle-like behavior of light, which was hotly debated at the time. Later, I applied the coincidence method to nuclear physics, measuring neutron scattering cross-sections and studying beta decay. For this, I shared the Nobel Prize in Physics in 1954 with Max Born. The mathematics must follow the experiment, not precede it, and the coincidence method is a prime example of how careful experimental design can resolve fundamental questions in quantum mechanics.
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